RUKO HSSE-Co8 multi-purpose hole saws are available in a range of Imperial sizes up to 8-1/4 inches, with cutting depths up to 1-1/2 inches. The nearest metric equivalent size is stamped on each tool. These bi-metal hole saws have a hardened steel backer and an 8% cobalt high-speed steel cutting edge for clean, efficient cuts in harder metals, including stainless steel.

Use High Speed Steel saws (HSS series
106xxx) with varied cutting teeth for more easily cut materials,
such as unalloyed steel (up to 700 N/mm2 strength), non-ferrous
and light metals, plastics, plasterboard and light building
boards, fiberboard, plywood and wood.

Use High Speed Steel Cobalt 8 saws (Co 8
series 126xxx) with fine cutting teeth for cutting harder metals
such as alloyed and non-alloyed steels (up to 1,000 N/mm2
strength), high chromium alloyed steels, such as stainless steel,
steels resistant to rusts and acids, non-ferrous and light
metals.

Hole
Saw Kits

Bi-Metal hole saw kits include either 6, 10 or 15 High-speed
steel or Colbalt 8 hole saws of various sizes in a plastic case.